mtg collectors edition cards New Magic: The Gathering “Ravnica Allegiance Mythic Edition” Collector to be Sold Exclusively on eBay In Commander Creases" on International/Collectors' Edition :

Spellshock S

It requires you to feed it either a black or blue but then lets you add either , , or to your mana pool

It's a +1/+1 win con, but it's red which is harder to add in the 99 since most +1/+1 counter caring leaders aren't that color, and then only shoots one dork not all of them, so it's a bit slower

So we expect this deck to be full of tokens and Squirrels, right

My best advice for players new to Modern would be to identify the kind of decks you like in other formats and see which decks in Modern look like those, and whether they look interesting here

When you do, Slinza fights target creature you don't control